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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 09 Jan 2012 (Monday) 21:36
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Help! Testing a used lens...what to look for?

 
nccb
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Jan 09, 2012 21:36 |  #1

Currently doing some googling on this topic but wanted to ask the experts. Testing a 10-22 tomorrow from a local craigslist ad. What things should I look for? (this is my first used deal)... Things already on my list....
-look for obvious signs of drop
-make sure the AF/MF switch works
-take shots on my camera @ different f stops, focal lengths
-test ring turns

What else?


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Clemson656
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Jan 09, 2012 21:47 |  #2

Besides what you already mentioned, I will look inside the lens for fungus or dust speck. Also, I'll carefully inspect the screws to see if the lens has ever been opened up for repair/service.


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nccb
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Jan 09, 2012 22:50 |  #3

How do I spot fungus and dust? Just look through both sides?


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rick_reno
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Jan 09, 2012 22:51 |  #4

If you care if it was refurbished, look for red glue (?) in a hole on the end of the lens where it attaches to the camera. Canon does that to their refurbished lenses. Bring a laptop or tablet along to view the photos on.




  
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vrjosh
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Jan 09, 2012 23:01 |  #5

Honestly, if the lens looks good physically, Af works, and a quick image check shows everything seems to be in order you should be good to go.


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titi_67207
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Jan 10, 2012 08:50 |  #6

Check the symmetry quality in the images : some used lenses suffer from optic di-symmetry .

Titi


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Amamba
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Jan 10, 2012 15:24 |  #7

In addition to the above, I'd do this:

- Check that the diaphragm opens and closes OK. I'd make test shots at several different F values.

- Gently shake the lens to see if anything is loose (if it's not an IS/OS/VR lens).

- Try to see if the multicoating is intact (it's usually pretty visible in reflected ligth).

- Test AF at different FLs, and also by putting camera in AF Servo & making it follow your hand or some other moving objects.

- If you have the right size filter, put it on to see if the threads are good.


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rick_reno
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Jan 10, 2012 15:37 |  #8

so...did you buy it?




  
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Help! Testing a used lens...what to look for?
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